I have a 1963 Super major, which has remote hydraulics on it. It is a unit that bolts untop the Hydrulic cover just behind the gear lever. This unit has a outlet for external hydraulics, and a knob which allows it to be turned on.
Have not come across these units on Ebay or elsewhere.
You might have to ge an external pump whch connects to front of engine crankshaft through a dog.
You could also go with a PTO hyd pump, but disadvantage is you lose the use of your PTO for other equipment.